@mixin center{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@mixin modal-shadow{
  box-shadow: 0 0 18px rgba(27,31,35,0.4);
  -webkit-box-shadow: 0 0 18px rgba(27,31,35,0.4);
  -moz-box-shadow: 0 0 18px rgba(27,31,35,0.4);
}

@mixin overlay_defaults{
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0px;
  left: 0px;
  right: 0px;
  bottom: 0px;
  z-index: 2;
}
